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• How to convert FFmpeg command to FFmpeg-Python code ?

  11 mars 2024, par Валентин Арно

  I have this command-line code :

  


  ffmpeg -hide_banner -hwaccel_device auto -hwaccel auto -thread_queue_size 2048 -f dshow -rtbufsize 2048M -pixel_format bgr24 -i video="screen-capture-recorder"  -thread_queue_size 2048 -f dshow -rtbufsize 2048M -channel_layout stereo -i audio="CABLE Output (VB-Audio Virtual Cable)" -filter_complex "[0:v]crop=1920:1040:0:0,scale=in_range=full:out_range=full:eval=init:interl=false:flags=bitexact+accurate_rnd+full_chroma_int,fps=fps=30.000,pp=fa[v1];[1:a]volume=volume=1.2[a1]" -map "[v1]" -map "[a1]" -c:a copy -c:v libx264 -preset ultrafast -tune film  -crf 17 -r 30 -force_key_frames expr:gte(t,n_forced*1) -sc_threshold 0 -pix_fmt yuvj422p -max_muxing_queue_size 2048 -copyts -start_at_zero -y -t 5 "Y:\test\ output_1".mkv


  


  Error : Stream specifier ':a' in filtergraph description ...matches no streams.

  


  And I want to convert it to ffmpeg-python code in Python.

  


  But how can I do it ?

  


  This is what I have done so far :

  


  video_ = ffmpeg.input('video=screen-capture-recorder',
                     thread_queue_size=2048,
                     rtbufsize='2048M',
                     pixel_format='bgr24',
                     framerate=30,
                     f='dshow'
                     )

audio_ = ffmpeg.input('audio=virtual-audio-capturer',
                     thread_queue_size=2048,
                     rtbufsize='2048M',
                     channel_layout='stereo',
                     f='dshow'
                     )
print(' '.join(  
      ffmpeg
      .filter(video_,'fps', fps=30.000)
      .filter(video_,'crop', 1920,1040,0,0)
      .filter(video_,'pp','fa')
      .filter(video_,'scale', in_range='full', out_range ='full', eval='init', interl='false', flags='bitexact+accurate_rnd+full_chroma_int')
      .filter(audio_,'volume',volume=1.2)

      .output('Y:\\test\\output_1.mkv', acodec='copy', vcodec="libx264", preset='ultrafast',
              tune='film', crf=17, r=30, force_key_frames='expr:gte(t,n_forced*1)',
              sc_threshold=0, pix_fmt='yuv420p', max_muxing_queue_size=2048,
              start_at_zero=None, t=15)
      
      .global_args('-hide_banner')
      .global_args('-hwaccel_device', 'auto')
      .global_args('-hwaccel', 'auto')
      .global_args('-report')
      .overwrite_output()
      .compile()
))


  


  Thanks.

  


• Videos created using FFmpeg are not being displayed in web browsers such as Chrome, Firefox, and Safari

  2 février 2023, par vijay

  I am attempting to generate an MP4 video by combining images and audio with FFmpeg-Kit-React-Native but it is not being displayed in web browsers.

  


  For your reference I'm attaching the package link below :
ffmpeg-kit-react-native

  


  The commands I utilized to produce the video are as follows :

  


  

  1. -i ${imageFile} -i ${audioFile?.uri} -vf scale=480:360 -f mp4 ${outputFile}

  


  2. -loop 1 -i ${imageFile} -i ${audioFile.uri} -shortest -acodec copy ${outputFile}

  


  3. -i ${imageFile} -i ${audioFile?.uri} -b:v 2M -vf scale=480:360:force_original_aspect_ratio=decrease,pad=480:360:-1:-1 -pix_fmt yuv420p ${outputFile}

  


  4. -i ${imageFile} -i ${audioFile?.uri} -vf scale=480:360:force_original_aspect_ratio=decrease,pad=480:360:-1:-1 -f mp4 ${outputFile}

  


  


  I have attached a link to the video I generated using a single image and one audio file

  


  Additionally, I am unable to install external encoding packages such as full-gpl, full, https-gpl, and min-gpl on the Android side.

  


• avcodec/mpegvideo_enc : use 64bit multiplication in dct_quantize_trellis_c and dct_qua...

  6 janvier, par Marton Balint

  avcodec/mpegvideo_enc : use 64bit multiplication in dct_quantize_trellis_c and dct_quantize_c
  Fixes corruption with :
  ffmpeg -t 1 -filter_complex "sine=f=21,showwaves=scale=cbrt:mode=line:colors=white:draw=full" -c:v mpeg2video -non_linear_quant 1 -qmin 1 -qmax 1 -cpuflags 0 out.mpg
  or
  ffmpeg -t 1 -filter_complex "sine=f=21,showwaves=scale=cbrt:mode=line:colors=white:draw=full" -c:v mpeg2video -non_linear_quant 1 -qmin 1 -qmax 1 -trellis 1 out.mpg
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavcodec/mpegvideo_enc.c